Description of On-Board Diagnostics

The anti-lock brake electronic control module is capable of performing a self-test using Rotunda Super Star II tester 007-00041 or equivalent. If the Super Star tester is not available, the anti-lock Quick Check sheet can be used as described.

The anti-lock control module monitors system operation and stores up all defined service codes in its memory. It is important to understand that the control module Cannot recognize some failures therefore if a problem exists and no service codes are stored by the control module, other diagnostic steps must be followed.

The module cannot store a service code if there is no power to the module. This fault code can be found by using Quick-Check Sheet.

A 20 series code will override any other stored code and will not allow other codes to be output if failure exists while the Self-Test is being run. If failure is intermittent or if code was left in the computer due to improper erasing procedures, the code will be output during Self-Test but the next code will also be output.